rfs: annotate lockless accesses to RFS sock flow table

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[ Upstream commit 5c3b74a92a ]

Add READ_ONCE()/WRITE_ONCE() on accesses to the sock flow table.

This also prevents a (smart ?) compiler to remove the condition in:

if (table->ents[index] != newval)
        table->ents[index] = newval;

We need the condition to avoid dirtying a shared cache line.

Fixes: fec5e652e5 ("rfs: Receive Flow Steering")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Eric Dumazet 2023-06-06 07:41:15 +00:00 • committed by Greg Kroah-Hartman

parent 3d9eface2e

commit 8a74ea37e1

2 changed files with 9 additions and 4 deletions

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7

include/linux/netdevice.h

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6

net/core/dev.c

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